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Object-oriented programming (OOP) is an approach to programming and software development that is focused on objects and the way that they interact. Objects surround us in the real world. I am a human being (a living thing!), and I am sitting here on my work desk with a cup (non living thing), inside of which is some coffee! I also have some cake. How do these objects interact? All objects have attributes and methods. Objects are instances of classes and classes can be thought of as the blueprints or templates from which objects are created.
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Recommended overview video (OOP concepts): https://youtu.be/m_MQYyJpIjg